干冷式冷却系统是一种通过采用自然通风原理达到冷却效果的冷却系统。
A dry cooling system is one which effectuates cooling according to the principles of natural air circulation.
应用流体力学和工业通风原理，分析了罗茨中央真空吸尘系统的管网阻力特性；
Tube Web obstruction property of Roots central vacuum cleaning system is analyzed with fluid mechanics and industry ventilate principle.
介绍了自然通风原理，用实例说明了泵房自然通风量的计算方法，同时通过定性与定量的分析提出了泵房合理利用自然通风的措施。
Principles of natural ventilation are described. Calculation method of air volume of pump house is illustrated. Measures to use natural ventilation are presented.
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